Steam reforming of methanol on binary Cu/ZnO catalysts: Effects of preparation condition upon precursors, surface structure and catalytic activity

被引:72
作者
Shen, GC [1 ]
Fujita, S [1 ]
Matsumoto, S [1 ]
Takezawa, N [1 ]
机构
[1] UNIV TORONTO,DEPT CHEM,TORONTO,ON M5S 3H6,CANADA
关键词
malachite; (M); Cu2CO3(OH)(2); hydrozincite; (H); Zn-5(CO3)(2)(OH)(6); aurichalcite; (A); (Cu; Zn)(5)(CO3)(2)(OH)(6); sodium zinc carbonate (SZC); Na2Zn3(CO3)(4); temperature programmed oxidation (TPO); turnover frequency (TOF);
D O I
10.1016/S1381-1169(97)00078-2
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Precursors for Cu/ZnO catalysts, with Cu/Zn molar ratios in the range from 100/0 to 0/100, were prepared by two coprecipitation methods. These methods differ by the addition rate of a mixed Cu(NO3)(2)/Zn(NO3)(2) solution to a NaHCO3 solution. Characterisation by powder X-ray diffraction (PXRD), differential thermal analysis (DTA), thermal gravimetric analysis (TGA), FT-IR and UV/VIS spectroscopies indicated that the structure of precursors with Cu/Zn ratios in the range of 30/70 to 70/30 depends greatly upon the addition rate of the mixed solution. Amorphous copper hydroxycarbonate and sodium zinc carbonate were formed prior to the various precursors such as malachite, aurichalcite and hydrozincite. The Cu/ZnO catalysts subsequently formed from the precursors showed the activity for steam reforming of methanol to vary with its composition. Based on the results of temperature programmed oxidation (TPO) with N2O and an infrared spectra of CO chemisorption, the TOF of the reaction is proposed to be associated with the surface of metallic Cu.
引用
收藏
页码:123 / 136
页数:14
相关论文
共 69 条
  • [1] ALWAN KA, 1980, T MET CHEM, V5, P3
  • [2] [Anonymous], 1951, DANAS SYSTEM MINERAL, V2, P247
  • [3] *ASTM, 1457 ASTM
  • [4] *ASTM, 1951, ACTA CRYSTALLOGR, V4, P200
  • [5] *ASTM, 10399 ASTM
  • [6] *ASTM, 17743 ASTM
  • [7] *ASTM, 181095 ASTM
  • [8] *ASTM, 191458 ASTM
  • [9] INVESTIGATION OF THE DISPERSION OF SUPPORTED COPPER-CATALYSTS BY OXYGEN-ADSORPTION AND NITROUS-OXIDE DECOMPOSITION
    BARTLEY, GJJ
    BURCH, R
    CHAPPELL, RJ
    [J]. APPLIED CATALYSIS, 1988, 43 (01): : 91 - 104
  • [10] OPTICAL-PROPERTIES AND ELECTRONIC INTERACTIONS OF MICROCRYSTALLINE CU-ZNO CATALYSTS
    BULKO, JB
    HERMAN, RG
    KLIER, K
    SIMMONS, GW
    [J]. JOURNAL OF PHYSICAL CHEMISTRY, 1979, 83 (24) : 3118 - 3122